Determination of thiabendazole residues in waters by solid-phase spectrofluorometry

Abstract

A new, sensitive and simple spectrofluorometric method for the determination of thiabendazole (TBZ) residues was studied. TBZ on Sephadex G-15 gel, pH 4.70 acetate buffer, is fixed to give fluorescence. The fluorescence of the gel-TBZ system, packed in a 1-mm quartz cell was measured directly using a solid-surface attachment. The applicable concentration range was 1.5-10.0 ng.mL-1 with a relative standard deviation of 1.4% and a detection limit of 0.1 ng.mL-1. The method was applied to the determination of thiabendazole in natural, waste, sea, and residual waters (98-100% recovery). The method is more sensitive and selective than other methods described in the literature. The presence of other fluorescent pesticides (dichlone, carbaryl, morestan, o-phenylphenol) with similar spectral features (lambda exc and lambda em neighboring to excitation and emission wavelengths of the TBZ) did not cause interference.

Metals in River Water

“…Ion-exchange spectrophotometry was used for the determination of molybdenum in a method described by Capitan et al 610 The molybdenum in natural water reacts with thiocyanate ion in the presence of stannous chloride, the reaction product is adsorbed on Dowex 1-8X-8 anion exchange, and the resin-phase absorbance is measured at 467 and 800 nm.…”

Simultaneous Flow-Injection Solid-Phase Fluorometric Determination of Thiabendazole and Metsulfuron Methyl Using Photochemical Derivatization

“…Due to its efficiency, it requires a low application ratio, but sensitive methodologies are necessary for its analysis. Among the methods reported for the determination of TBZ, UV spectrophotometry 10 and fluorescence spectroscopy [11][12][13] have been widely used but, in both cases, in spite of the low detection limits achieved, important interferences were detected. Moreover, chromatographic [14][15][16] and enzyme-linked immuno-sorbent assay (ELISA) 17 methods have been proposed for TBZ determination.…”

Multicommuted Fluorometric Multiparameter Sensor for Simultaneous Determination of Naproxen and Salicylic Acid in Biological Fluids

“…[1][2][3] This technique is based on the retention/preconcentration of the analyte/target species on an appropriate solid support, implemented by direct spectrometric measurements on a solid sensing phase. The combination of continuous flow systems (i.e.…”